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( Ex: 好 ou 你好 ou 花好月圆 )
zhì xīn
质心 zhì xīn
  1. 质量中心,物体作用力(合力)的中点位置,该点受力时物体只作平动而不发生转动
  2. 研究较小物体时,把质心看作与重心重合
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